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libavdevice
sndio_dec.c
Go to the documentation of this file.
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/*
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* sndio play and grab interface
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* Copyright (c) 2010 Jacob Meuser
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*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <stdint.h>
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#include <sndio.h>
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#include "
libavformat/avformat.h
"
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#include "
libavformat/internal.h
"
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#include "
libavutil/opt.h
"
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#include "
libavutil/time.h
"
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#include "
sndio_common.h
"
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static
av_cold
int
audio_read_header
(
AVFormatContext
*
s1
)
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{
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SndioData
*
s
= s1->
priv_data
;
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AVStream
*st;
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int
ret
;
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st =
avformat_new_stream
(s1, NULL);
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if
(!st)
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return
AVERROR
(ENOMEM);
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ret =
ff_sndio_open
(s1, 0, s1->
filename
);
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if
(ret < 0)
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return
ret
;
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/* take real parameters */
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st->
codec
->
codec_type
=
AVMEDIA_TYPE_AUDIO
;
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st->
codec
->
codec_id
= s->
codec_id
;
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st->
codec
->
sample_rate
= s->
sample_rate
;
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st->
codec
->
channels
= s->
channels
;
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avpriv_set_pts_info
(st, 64, 1, 1000000);
/* 64 bits pts in us */
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return
0;
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}
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static
int
audio_read_packet
(
AVFormatContext
*
s1
,
AVPacket
*
pkt
)
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{
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SndioData
*
s
= s1->
priv_data
;
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int64_t bdelay,
cur_time
;
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int
ret
;
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if
((ret =
av_new_packet
(pkt, s->
buffer_size
)) < 0)
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return
ret
;
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ret = sio_read(s->
hdl
, pkt->
data
, pkt->
size
);
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if
(ret == 0 || sio_eof(s->
hdl
)) {
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av_free_packet
(pkt);
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return
AVERROR_EOF
;
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}
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pkt->
size
=
ret
;
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s->
softpos
+=
ret
;
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/* compute pts of the start of the packet */
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cur_time =
av_gettime
();
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bdelay = ret + s->
hwpos
- s->
softpos
;
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/* convert to pts */
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pkt->
pts
= cur_time - ((bdelay * 1000000) /
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(s->
bps
* s->
channels
* s->
sample_rate
));
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return
0;
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}
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static
av_cold
int
audio_read_close
(
AVFormatContext
*
s1
)
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{
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SndioData
*
s
= s1->
priv_data
;
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ff_sndio_close
(s);
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return
0;
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}
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static
const
AVOption
options
[] = {
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{
"sample_rate"
,
""
, offsetof(
SndioData
,
sample_rate
),
AV_OPT_TYPE_INT
, {.i64 = 48000}, 1, INT_MAX,
AV_OPT_FLAG_DECODING_PARAM
},
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{
"channels"
,
""
, offsetof(
SndioData
, channels),
AV_OPT_TYPE_INT
, {.i64 = 2}, 1, INT_MAX,
AV_OPT_FLAG_DECODING_PARAM
},
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{ NULL },
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};
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static
const
AVClass
sndio_demuxer_class
= {
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.
class_name
=
"sndio indev"
,
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.item_name =
av_default_item_name
,
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.option =
options
,
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.version =
LIBAVUTIL_VERSION_INT
,
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};
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AVInputFormat
ff_sndio_demuxer
= {
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.
name
=
"sndio"
,
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.long_name =
NULL_IF_CONFIG_SMALL
(
"sndio audio capture"
),
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.priv_data_size =
sizeof
(
SndioData
),
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.
read_header
=
audio_read_header
,
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.
read_packet
=
audio_read_packet
,
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.
read_close
=
audio_read_close
,
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.
flags
=
AVFMT_NOFILE
,
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.priv_class = &sndio_demuxer_class,
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};
Generated on Wed Jul 10 2013 23:48:08 for FFmpeg by
1.8.2